Internal-combustion engine



W. H. CLOWRY.

INTERNAL COMBUSTION ENGINE. APPLICATION FILED FEB; 14, I921.

L84g93 Patented Oct. 311, 119220 MM Q I vi;

WILLIAM E. enor, or cmcaeo, rumors. a

v mrnnnan-comnus'rron ENGINE.

Application filed iebruary l, 1921. Serial F0. 444,889.

To all whom it my concern Be it known that I,WILLIAM H.,CLOWRY, a citizen of the United States,re,siding at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Internal-Combustion Engines, of which the following is a specificatlon.

This invention relates to internal coinbustion engines, and its object is to provide a novel and improved arrangement of inlet and exhaust ports whereby a thorough scavenging action, with a consequent greater efliciency, is obtained.

In order that the invention may be better understood, reference is had to the accompanying drawing, forming a part of this specification in'whlch,

Figure '1 is a central longitudinal section of the cylinder of the engine showing the arrangement of inlet and exhaust ports, and Fig. 2 is a horizontal section on the line 2-2 of Fig. 1.

Referring specifically to the drawing, 5 denotes the cylinder of the engine, and-6 the piston therein, the latter being shown at the end of the firing stroke.

In the head of the cylinder 5 is an inlet port 7, and in the side wall of the cylinder are exhaust ports 8, these ports being positioned such a distance from the cylinder head as to be uncovered by the piston 6 at or near the end of its firing stroke. The port 7 is provided with a valve 9 operated automatically by suction or by any suitable mechanism to open at or near the 'end of the firing stroke of the piston to admit a fresh charge to the cylinder which is compressed on the return stroke of the piston, the valve 9 in the mean time having closed.

The ports 8 extend in a circular series completely around the c linder 5, and the latter is formed exterior y with a spacious chamber 10 into which said ports discharge. A pipe 11 is connected to the chamber 10 to carry the exhaust gases away. The large number of exhaust ports permits the spent gases to uickly pass out of the cylinder, and the cy inder is therefore well scavenged. The outer end of the pipe 11 is provided tering the cylinder.

with a hinged and weighted lid 12, which is pushed open by the exhaust gases, but remains shut to prevent-the entrance of air, which would weaken the fuel mixture in the cylinder.

. The ports- 8, while. shown circular in shape may be, made square as indicated by fine dotted lines orinan other form best suited to the purpose. A so the distance of the ports from the end of the piston stroke may be varied to secure the best results from the particular ty e of engine.

The engine wil not operate with a full throttle at low s ed without the valve, for the reason that t e-vacuum is destroyed by air entering the cylinder through the exhaust ports, thus preventing fuel charges from en- Again, without the valve,-the engine will not start because on the suction stroke, whenthe piston uncovers the exhaust ports, air is drawn in through the latter, thinningthe mixture too much. At high speeds, the valve remiains open, the successive explosions occurring at'such short intervals that therens not sufiicient time for the valve to close. At low speed, the valve is closed by the vacuum in'the cylinder which varies as the force of the explosion, and this vacuum reloads the cylinder throu h the intake by the action of theclose valve 12., The back pressure resulting from the valve isnegligible, and preignition will not occur unless too stifi' a spring is used.

I claim:

In an internal combustionengine, a cylinder, and a piston therein, the cylinder having a valye-controlled inlet portat its rear end, and exhaust ports at its forward end which are uncovered by the piston at or near the end of its firing stroke, said exhaust ports extending in a circular series around the cylinder, and of the latter into which said ports discharge, said chamber having an outlet valve adapted to open for discharge only.

In "testimony whereof I afiix my signature.

' WILLIAM H. CLOWRY.

a chamber on the outside 

